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Based on negative refractive index materials super lens imaging studies

Author: YiZuoJie
Tutor: ZhouXiuLi
School: University of Electronic Science and Technology
Course: Optics
Keywords: artificial electromagnetic materials negative refraction perfect imaging near-field subwavelength imaging FDTD
CLC: TB34
Type: Master's thesis
Year: 2011
Downloads: 274
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Abstract


Negative refraction index metamaterials, a special sort of metamaterials whose permittivity and/or permeability approach negative is one of the most interesting topics in physics and electromagnetics areas. It emerges with the development of Left-Handed metamaterials. Both of them have the same physical basis. Recently, there are mainly three kinds of negative refraction index metamaterials: ENI medium (Epsilon Negative Index metamaterials), MNI medium (Mu Negative Index metamaterials) and DNI medium (Double Negative Index metamaterials). In this thesis, focus is placed on the ENI metamaterials. Describes the properties of this artificial electromagnetic materials and the methods of analysis, and discuss the negative refraction electromagnetic response characteristics of the metamaterials, Meanwhile, focus is placed on the subwavelength image mechanism, negative refraction properties and the virtual imaging of the array nanowires.The main work of this paper is summarized as follows. First of all,we improve the negative refraction exact physical model of the array periodic metallic. Our focus is on the adjustment the negative refraction and virtual imaging through the changes of the arrangement of metal wires, the periodic lattice constant, and the radius of the nanowires and the shape of the cross-section. In this process, we need to consider the skin effect, when the incident electromagnetic wave is much larger than the size of the cell, this material can be regard as a homogeneous medium. We obtained the rules of negative refraction and virtual imaging in small changes of the nanowires by simulation. It is that different arrangement of the nanowires, periodic lattice and radiuses, which means different fill factor, affect the quality of the negative refraction and virtual imaging. However, the negative refraction and virtual imaging is almost not affected, when only the cross-section shapes change. And we are confirmed by the simulation of the FDTD-solutions software. Additionally, we analysis the subwavelength imaging mechanism of the structure of the nanowires, and utilize the CST software to simulate the near-field subwavelength imaging in the microwave band, THz band and optical band. Finally, we also analyzed the propagation characteristics in negative refraction index materials and“perfect imaging”mechanism.

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